Patent US4008397A successfully refreshed from Google Patents.
US4008397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorometer flow cell
Assignee: Hoffmann La Roche Inc
•
Filing: 1975-04-24
•
Granted: 1977-02-15
•
Expires: 1995-04-24
Abstract
Abstract An improved fluorometer flow cell is described wherein the flow cell is constructed entirely of a light transparent polyfluoroethylene tubing.
Inventors
- 👤 Joseph John Zdrodowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:46
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/0303
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
In a fluorometer consisting of A. light source means; B. excitation filter means; C. cell holder means; D. emission filter means; and, E. photo detector means, the improvement which comprises providing said cell holder means with a flow cell consisting of polyfluoroethylene tubing which is in operative optical relationship with said light source, said excitation filter means, said emission filter means and said detector means.
Claim 2
Dependent Claim
65 words
In a fluorometer consisting of A. light source means; B. excitation filter means; C. cell holder means; D. emission filter means; and, E. photo detector means, the improvement which comprises providing said cell holder means with a flow cell consisting of polyfluoroethylene tubing which is in operative optical relationship with said light source, said excitation filter means, said emission filter means and said detector means.
Claim 3
Dependent Claim
12 words
The fluorometer of claim 1 wherein said polyfluoroethylene is of optical grade.
Claim 4
Dependent Claim
40 words
The fluorometer of claim 1 wherein said polyfluoroethylene tubing has fittings at a first end to provide direct leakproof connection with an inlet source and has fittings at a second end to provide direct leakproof connection with an outlet source.
Claim 5
Dependent Claim
22 words
The fluorometer of claim 3 wherein the inner diameter of said polyfluoroethylene tubing is the same as that of said inlet source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |